The T30 Howitzer Motor Carriage (HMC) was a United States Army self-propelled gun used in World War II. Its design was based on requirements for an assault gun issued by the Armored Force in 1941 and it was built as an interim solution until a fully tracked design was complete.Produced by the White Motor Company, the vehicle was simply a 75 mm Pack Howitzer M1 mounted on modified a M3 Half-track. It was first used in combat in the North African Campaign in November 1942.